Vista VK2-1080XVRDPTZ User Manual page 22

Users can reset the selected screen size anytime while monitoring the screen on a real-
time basis.
- Bit rate control: Limiting the maximum bit rate helps control the bandwidth used by the
H.264 video stream. Leaving the Maximum bit rate as unlimited maintains consistently
good image quality but increases bandwidth usage when there is more activity in the
image. Limiting the bit rate to a defined value prevents excessive bandwidth usage, but
images are lost when the limit is exceeded.
NOTE: The maximum bit rate can be used for both variable and constant bit rates.
The bit rate can be set as Variable Bit Rate (VBR) or Constant Bit Rate (CBR). VBR
adjusts the bit rate according to the image complexity, using up bandwidth for increased
activity in the image, and less for lower activity in the monitored area.
CBR allows you to set a fixed target bit rate that consumes a predictable amount of
bandwidth. As the bit rate would usually need to increase for increased image activity, but
in this case cannot, the frame rate and image quality are affected negatively. To partly
compensate for this, it is possible to prioritize either the frame rate or the image quality
whenever the bit rate needs to be increased. Not setting a priority means the frame rate
and image quality are equally affected.
- Bit rate: When the priority is for fast updating images, the user can reduce the max bit rate.
On the other hand, when it is necessary to maintain a detailed monitoring screen by
enhancing the image quality, users can do so increase the max bit rate. In each case,
please adjust this function according to the network status and monitoring purposes.
- Frame rate: Upon the real-time play, users should select a frame refresh rate per second.
If the rate is high, the image will become smooth. On the other hand, if the rate is low, the
image will not be natural but it can reduce a network load.
- GOP size: Select the GOP (Group of Picture) size. If users want to have a high quality of
fast image one by one, please decrease the value. For the purpose of general monitoring,
please do not change a basic value. Such act may cause a problem to the system
performance. For the details of GOP setting, please contact the service center.
 Stream 2 Setting: Sometimes the image size is large due to low light or complex scenery.
Adjusting the frame rate and quality helps to control the bandwidth and storage used by the
Motion JPEG video stream in these situations. Limiting the frame rate and quality optimizes
bandwidth and storage usage, but may give poor image quality. To prevent increased
bandwidth and storage usage, the Resolution, Frame rate, and Frame Quality should be set
to an optimal value.
- MJPEG Resolution: Same as the stream 1 settings.
- MJPEG Frame rate: Same as the stream 1 settings.
- MJPEG Quality: Select the picture quality. If users want to have a high quality of fast
image one by one, please decrease the value. For the purpose of general monitoring,
please do not change a basic value. Such act may cause a problem to the system
performance.
 Stream 3 Setting: Same as the Stream 1 Setting.
When satisfied with the settings, click the Save button, or click the Reset button to revert to
previously saved settings.
VK2-1080XVRDPTZ User Manual V1.0
22